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Borrowings - Weighted Average Maturities and Interest Rates of Borrowings (Details) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2013
Sep. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]      
Debt Balance   $ 227,167 $ 225,158
Weighted Average Remaining Maturity   2 years 2 months 12 days 1 year 1 month 6 days
Weighted average interest rate   1.90% 1.80%
Wells Facility borrowings [Member]
      
Debt Instrument [Line Items]      
Debt Balance   156,969 [1] 225,155 [1]
Weighted Average Remaining Maturity   10 months 24 days [1],[2] 1 year 1 month 6 days [1],[2]
Weighted average interest rate   1.40% [1] 1.80% [1]
Variable rate basis   LIBOR LIBOR
Basis points     1.50%
Wells Facility borrowings [Member] | Minimum [Member]
      
Debt Instrument [Line Items]      
Basis points   1.05% 1.25%
Wells Facility borrowings [Member] | Maximum [Member]
      
Debt Instrument [Line Items]      
Basis points   1.75% 2.35%
UBS Facility borrowings [Member]
      
Debt Instrument [Line Items]      
Debt Balance   70,195  
Weighted Average Remaining Maturity   5 years  
Weighted average interest rate   2.90%  
Basis points   1.55%  
JPMorgan Facility borrowings [Member]
      
Debt Instrument [Line Items]      
Debt Balance   $ 3 $ 3
Weighted Average Remaining Maturity   1 year 3 months 18 days [2] 5 days
Weighted average interest rate   2.70% 2.70%
Variable rate basis LIBOR LIBOR LIBOR
Basis points 2.50% 2.50% 2.50%
[1] At December 31, 2012, borrowings outstanding under the Wells Facility bore interest at LIBOR plus 125 basis points, 150 basis points or 235 basis points depending on the collateral pledged. At September 30, 2013, borrowings outstanding under the Wells Facility bore interest at LIBOR plus 105 basis points or 175 basis points depending on the collateral pledged.
[2] Assumes extension options are exercised.